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DEBT - Convertible Note Hedge and Warrant Transactions (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended
Jul. 24, 2020
May 31, 2017
Jun. 30, 2021
Jul. 21, 2020
May 24, 2017
Debt Instrument [Line Items]          
Share price (in dollars per share)     $ 211.88    
Termination of convertible note hedge on the 0.625% Convertible Senior Notes     $ 109.9    
Payments for repurchase of warrants     $ 94.3    
2020 Hedge and Warrants          
Debt Instrument [Line Items]          
Net proceeds from debt used to pay for the cost of the hedge $ 63.0        
Payment of convertible note hedge transactions $ 124.2        
Number of shares covered by the hedge transactions 1.2        
Initial conversion price per share (in dollars per share) $ 461.19        
Strike price of warrants sold (in dollars per share) $ 709.52        
Premium of warrant strike price over sales price of common stock 100.00%        
Share price (in dollars per share)       $ 354.76  
Proceeds from the sale of warrants related to the Convertible Senior Notes $ 61.2        
2017 Hedge and Warrants          
Debt Instrument [Line Items]          
Net proceeds from debt used to pay for the cost of the hedge   $ 18.1      
Payment of convertible note hedge transactions   $ 61.5      
Number of shares covered by the hedge transactions 0.8 1.4      
Initial conversion price per share (in dollars per share)   $ 207.63      
Strike price of warrants sold (in dollars per share)   $ 266.39      
Premium of warrant strike price over sales price of common stock   70.00%      
Share price (in dollars per share)         $ 156.70
Proceeds from the sale of warrants related to the Convertible Senior Notes   $ 43.4      
Proceeds from hedge and warrants $ 15.6